Seawater intrusion occurs in almost all coastal aquifers that are subject to human pressure. Its effects could be reduced by avoiding pumping in those wells better hydraulically connected to the sea. This paper presents a methodology to assess hydraulic connection to the sea of a well from its response to sea-level fluctuations. Head fluctuations in a well result from the superposition of hydraulic and hydro-mechanical responses. The hydraulic response requires a good hydraulic connection to the sea, whereas a hydro-mechanical response suggests a poor connection. Sea level fluctuates with a broad range of harmonics, which allows identification of the hydraulic and hydro-mechanical responses based on the harmonic frequency. It is shown that the response to low-frequency harmonics is essentially hydraulic and the response to high-frequency harmonics is mainly hydro-mechanical. The proposed methodology facilitates the discrimination of both responses with the aim to study qualitatively the hydraulic connection to the sea. This methodology is applied to the aquifer system of La Plata river estuary in western Argentina. Surprisingly, the hydraulic response of the deepest aquifer (Paraná) is less damped than the response of the overlaying aquifer (Puelches). This finding suggests that the Paraná aquifer is better connected to the sea than the Puelches.

几乎所有承受人类压力的沿海含水层都发生海水入侵。通过避免在与海面液压连接更好的井中抽水，可以减少其影响。本文提出了一种方法，可以根据其对海平面波动的响应来评估与海域的水力连接。井头的波动是水力和水力响应叠加的结果。水力响应要求与海的良好液压连接，而水力力学响应则表明连接不良。海平面波动范围很广，可以根据谐波频率识别水力和水力机械响应。结果表明，对低频谐波的响应基本上是水力响应，而对高频谐波的响应主要是水力响应。拟议的方法有助于对两种反应的区分，目的是定性研究与海的水力联系。该方法适用于阿根廷西部拉普拉塔河河口含水层系统。出人意料的是，最深含水层（Paraná）的水力响应比上覆含水层（Puelches）的水力阻尼要小。这一发现表明，巴拉那州含水层比普尔切斯州与海洋的连接更好。该方法适用于阿根廷西部拉普拉塔河河口含水层系统。出人意料的是，最深含水层（Paraná）的水力响应比上覆含水层（Puelches）的水力阻尼要小。这一发现表明，巴拉那州含水层比普尔切斯州与海洋的连接更好。该方法适用于阿根廷西部拉普拉塔河河口含水层系统。出人意料的是，最深含水层（Paraná）的水力响应比上覆含水层（Puelches）的水力阻尼要小。这一发现表明，巴拉那州含水层比普尔切斯州与海洋的连接更好。